Fun,
I think your initial postings in this thread did come accross as a bit bigoted. I was, and am, however, willing to give the benefit of the doubt that what I was inferring was not what you intended. Indeed, I've said many things online that painted me as far more of a bastard than I really am. (No small feat, btw; I really am quite a bastard.)
Anyway, since these people really aren't friends of yours, were I in your shoes, I would not go. Hell, I only went to my best friend's graduation because it was mine, too. I don't think there's any harm in attending at all, particularly if everyone's motives are honest and known. I don't think you should feel any obligation to attend, either, though.
Do what thou wilt, I guess.